I see what you mean, but still, they're buffing his HP, and to be honest, you don't HAVE to build him metagolem. You can build something like a Rylai's/FMallet into just damage. Alternatively, I don't see what's entirely wrong with it, but I still do get your point.
If you are made to go full on AP due to hard ad on your team, you will pretty much fall off hard or have to follow the Rilay's-RoA's path with no much choice to go.. Different from before.